dss354201 dss354201

04-06-2020
Mathematics

contestada

please help me. how would you change x + 3y = 18 -3x -12y = -75 to eliminate y showing all of the work

Respuesta :

KurdishPotato KurdishPotato

04-06-2020

Answer:

x = -3

y = 7

Step-by-step explanation:

x + 3y = 18

-3x - 12y = -75

multiply first equation by 4

4 × (x + 3y) = 18 ➡ 4x + 12y = 72

now add the two equations up

4x + 12y - 3x -12y = 72 - 75 (-12y will eliminate 12y)

x = -3

Answer Link

Otras preguntas

This question is based on Listening Comprehension CD 4L, Side A/Track 1, the first selection. What language does the princess speak? A. French B. Korean

Find the volume of the solid whose base is the circle x^2+y^2=64 and the cross sections perpendicular to the x-axis are triangles whose height and base are equa

a cube of gold (density = 19.3 g/cm cubed) is measured and the length of its side is 5.00 cm. what is the mass of the cube?

1 2/3% of it is 4.75

when solving absolute value equations, how would i solve 15 -2k =45?

Differences between down syndrome and turner syndrome

Aspirin reduces fever by __________. blocking the effect of prostaglandins in the hypothalamus blocking the effect of prostaglandins in the medulla stimulating

7.38 is 7.5% of what number?

A compound with a molar mass of 100.0 g/lol has an elemental composition of 24.0% C, 3.0% H, 16.0% O and 57.0%F. What is the molecular formula of the compound?

Is it illegal to be gay in united states?